General Science^ 193 
or card, as a substitute for the magnesian limestone usually em- 
ployed. This card is covered on one or both faces with an ar- 
gillo-calcareous mixture, which has the property of receiving the, 
ink or the crayon in the same way that the stone does, and of 
undergoing the ordinary preparation, and furnishing impressions 
as neat and perfect as those obtained from designs traced on 
stone. Count Lasteyrie has examined and Used this paper, and 
given a favourable report upon it. 
3()> ManufO'Cture of Glass..— M. Westrumb, is said to have 
found, that the salts of potash and soda, deprived of their water 
of erystailisation, answer as well as the pure alkali for the manu- 
facture of glass, In order to make an excellent glass, 24! parts 
of sulphate of soda are thoroughly dried, and mixed with B 
j)arts of powdered charcoal, and 16 of good white sand. The 
mbcture must be calcined in the drying oven? until the sulphate 
is dissipated, and is then put into the pots for ixmox^.'-r’Annales 
Gen. de Phi/s. de BruiveUes^ May 1820. 
31. DarJc-hrown Streak on the Sea occasioned hy Crabs.— 
On the 6th December 1815, Captain Kotzebue observed on the 
the surface of the sea, near the Island of St Catharine, a ser- 
pentine streak, about two fathoms broad, of a dark brown co- 
lour, which extended as far as the eye could reach. Upon exa- 
mining it, it was found to be occasioned by an innumerable 
quantity of small crabs, and the seeds of^ a marine plant— Kot- 
zebue’s vol.i. p. 113* 
32. Height of the Mountains in Owhyee a'ad Mowee. — The 
gigantic height of the mountains of these islands has made them! 
the admiratioii of navigators; Captain Kotzebue found their 
height to be as follows : 
Toises. 
Island of Owfayee. — Merino lloa,' - » 2482.4* 
Merino Kaah, - - 2180.1 
Merino Wororai, - « 1687.1 
island of Mowee.~Higliest Peak, = - 1669.1 
Kotzebue’s Voyage of Discovery^ vol. i. p. 318. 
33. Instmct of the Honey.-Eaier jBird.— Captain Kotzebue 
mentions the following circumstance respecting these birds. The 
Hottentots, who have a very quick sight, try to observe a bee 
vol; vl ko. 11, JANUARY 1822; ir 
